Birthday Performance Members of the U.S. Air Force Honor Guard commemorate the Air Force’s 74th birthday at the Intrepid Sea, Air and Space Museum in New York City, Sept. 18, 2021. SHARE IMAGE: Download Image: Full Size (0.61 MB) Tags: Air Force Photo By: Air Force Senior Airman Kevin Tanenbaum VIRIN: 210918-F-YM181-0068C.JPG Photo Gallery